Improvement in weft-stop mechanism for looms



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UNITED l STATES JOHN J. SWITZER, OF BOSTON, ASSIGNOR TO HIMSELF, EDWIN H. FITTZ, OF l "PATENT OFFICE.

NORTHBOROUGH, VVILLARD COMEY, OF WESTBOROUGH, AND EDWARD B. PENDLETON, OF WESTERLY, MASSACHUSETTS.

IMPROVEMENT IN WEFT-STQP MECHANISMFOR LOOMS.

Specification forming part of Letters Patent No. 119,798, dated October l0, 1871 antedated September 25, 1871.

To all whom it may concern:

Be it known that I, JOHN J. SwrrzER, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Stop-Motions for Looms, of which the following is a specification:

The nature of my invention consists in combining, with the lay of a loom, light levers and suitable adjuncts, and so arranging the same that at each'motion of the lay the levers will fall upon the weft-thread if the weft-threadbe unbroken, but if the weft-thread is broken then the levers will fall below the line ofthe weft into a position in which they, acting through a certain mechanical device, serve to throwT oft' the belt from the driving-pulley and thus stop the machine, the object being to stop the action of the loom whenever the weft-thread breaks.

Figure l is a plan, showing parts of a loom with my invention attached. Fig. 2 is an elevation of the same. Fig. 3 is a cross vertical section of the same. Fig. 4 is a perspective view, showing the essential features of my invention.

A A represent the frame of a loom, t0 which the layB Bl B2 and other parts are attached. K is the crank-shaft, which, acting through the pitman K1, actuates the lay. B2 is a shuttle race, formed in the ordinary manner, except that it has, near each end, a slot, S, cut across it. F F are two levers, attached to the shuttle-race by screws f f, about which they swing. The lower ends of these levers are attached to the bar F1 in such a manner that the bar F1 may swing longitudinally. This bar is drawn to the left by the spring F, and to the right, as the lay makes its back stroke, by the fixed guide F8, Fig. l, which presses a standard, F1, attached to the bar F1. F1 has upon its end a boss, F2, which, as the lay advances, will come in contact with the end F3 of the lever F4 whenever the bar F1 is not drawn back by the spring F6. When it is drawn back by the spring F6 then the boss F2 will pass by the end of the lever F3 F4 without moving it. The lever F3 F4 swings on a pivot near its center, and serves to release the spring-lever H and allow it to draw the belt-shipper H1 back, so as to shift the belt from the fixed to the loose pulley-not shown in the drawing-and thus stop the ma- This barchine. C G1 is a light lever or weft-detector, pivoted, as shown, to the back of the lay. At each stroke of the lay the lever O1 is drawn up. This is effected by the spring U2, which is connected to an arm, O3, of the rock-shaft G4. This rockershaft is hung under the lay, and is operated by 'an arm, O6, which is connected by a strap, C1 C,

to the rear part of the frame A. By inspection of Fig. 3 it will be seen that as the lay advances, carrying with it the rocker-shaft G4, this rockershaft will be made to make a partial revolution, from the fact that the strap O1 C8 will hold back the arm G6, thus causing' the shaft to revolve, carrying down the arm O3 and spring C2, which action will throw up the lever C C1. As the lay begins its return stroke the counter-balance C5, acting through the rock-shaft G4 and arm O3, allows the lever C O1 to drop, unless held up by the latch D1. D is a hanger, attached to the bar B1, and so arranged that it may swing toward the end of the lay but not toward the center. D1 is a small latch, hung to the side of the hanger D, as shown in Fig. 4. This latch has a stop-pin, d', and is so arranged as to allow the lever G1 in its upward motion to swing it back, and thus pass beyond it 5 but as the lever C1 falls back the latch D1 holds it, as shown in Figs. 3- and 4. D3 is a latch, attached to the lower end of the hanger D, and hangs so low that the shuttle in its passage will hit it. The shuttle in its passage out of the box will hit the latch D3, and swing it forward without moving the hanger D but in the passage ofthe shuttle into the box it will hit the latch D3 and carry it, with the hanger D, backward so far as to move the small latch D1 away from the lever O1, and thus to allow it to drop upon the weft-thread; or, in case the weft-thread is broken, to fall into the slot S.

The operation of my invention is as follows: As the shuttle passes backward and forward it causes one of the hangers D to swing back, and thus allow the corresponding lever O1 to drop upon the weft-thread. Each motion of thelay throws back these levers or weft-detectors C1, as has been explained. Now, in case the weft-thread is broken, the lever C1, which is released by the passage of the shuttle, will drop into the slot S, as shown in Fig. l; and, as its end projects beyond the face advances, the boss F2 Will come in contact With of the racefvay, it will come in contact with the end of lever F, as shown in Fig. 1, and thus preveasing F from swinging', aud as the har I1 is connected with the lever F it cannot be drawn` back by the spring F6; in Which case, as the lay the cud F3 of the lever F4 F5, and cause it to swing so as to release the belt-shitting lever H and thus stop the motion of the loom. The operator can then reattach the weft-thread to the shuttle, and, after raising the lever C1 so it may rest on the latch D1, again start the loom.

I claim as my invention.-

forth.

JOHN J. SWITZER.

Witnesses JAs. S. CONANT, FRANK G. PARKER. 

